Research on interleaved parallel CCM Boost PFC converter

Abstract

This paper adopts duty cycle compensation current control strategy to resolve the increasing current stress in one of the branches of the interleaved parallel Boost PFC converter, which is caused by the unequal branch current when the power factor correction converter works in inductor current continuous conduction mode. By adding the duty cycle compensation controller in the traditional controller，the branch current can be equalled and decrease the current stress. Lastly, the simulation is created. Before adopting the new strategy, the two branch current are 5 A and 2.2 A, the peak current of the MOSFET in 5 A branch is 9.2 A; After adoping the new strategy, the two branch current are both 3.6 A, the peak current of the MOSFET in both branch are 6.8 A. From the analysis of the simulation，the new strategy can achieve the equal branch current and decrease the branch current stress. Simultaneously, the feasibility of the interleaved-parallel CCM Boost PFC converter under the new strategy is verified.

Keywords

• interleaved parallel
• Boost PFC converter
• average current control
• duty cycle compensation control